Tinner&#39;s riveting mandrel



Patented Feb. 14, 1928.

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MARTIN B. MCCLEERY, OF PLEASANTVILLE, OHIO.

TINNERS RIVETING MANDREL.

Application filed January 31, 1927. Serial No. 164,955.

The object of this invention is to provide an improved mandrel especially adapted for the use of tinners in riveting the lapped margins ofsheetmetal, as for example in making pipe.

The invention is embodied in the example shown and described, the features of novelty being finally claimed.

In the accompanying drawing Figure 1 is mainly a central longitudlnal sectional view of the mandrel according to my invention, some parts being in full.

Fig. 2 is a detail of the ratchet head looking to the left from the line II-II Fig. 1, with parts in section.

Fig. 3 is a section on the line II-II Fig. 1 looking to the left, some parts in full.

Fig. 4 is a view of the rotary eccentric carrying member removed from the shell looking toward the right from the aforesaid line IIIIII Fig. 1.

Fig. 5 is a plan of the upper edge of the rivet supplying pin guiding ring employed in the construction.

In the views 6 designates a stout cylindrical shell of suitable metal, said case constituting the body of the mandrel. Fitting within the case is a series of rotary cylindrical slugs 7, 8, 9, 10 and 11 and an end closing member 12, the last named being fixed by a screw 12. Each of the members 7, 8, 9, 10 and 11 has projecting from one end (the right handend as shown in Fig.

1) an identical eccentric such as shown at 13 and two pins 14, 14 located at opposite sides of the axis of motion of the eccentricand each of the slugs 8, 9, 10, 11 and 12 in its recessed left hand end two sector-like projections 15,15 located on opposite sides of the axis of motion of the slug and between which is placed a loose bar 16 adapted to be rocked between and arrested by said projections 15, 15, said bar being adapted to be engaged at its ends by the pins 14;, 14, when 5 a slu containing the ins is turned. to turn the s ug containing said bar 16 in the same direction. By reason of the play of the bar 16 the actuated slug containing the pins can be idly rocked through an arc of 180 degrees in either direction. It will be observed that the construction is such that there is lost motion between the slugs and that rotary motion is not imparted from one slug to the next in the series until the bar 16 of the 56 next is arrested by the projection 15. It

will also be observed that by continuing, in one direction, the rotation of the first slug 7. all'the'pins 14, 14, eventually become engaged with'all arrested bars 16 so that all the slugs except that designated 1:2 will then be operatingly connected together and rotate in unison. Further the construction is such that either the low points of the eccentrics (or their high points) can all lie in a line parallel with the axis of the shell. WVhen all the low points are down the first slug can be turnedto bring the high points of its eccentric up while the high points of all the. others are still down; and the eccentric of the second slug is turned to bring its high point up by turning the first slug to the positionwith its high point down and so on through the series hence by turn ing the first slug in one direction the eccentrics of the series are brought in succession with their high points to elevated position. In this successive operation the centric of the first slug is revolved in one direction until the last eccentric is raised to elevated position.

Loosely. seated in each of a series of holes through the top of the shell above the eccentric is a. pin 17 resting by gravity upon the edge of the eccentric and the upper end of whichafiords a seat for an inverted rivet 1,8 with its point just below the surface of the shell when the eccentric is lowered. The turning of the eccentric as before described elevates the rivet as shown in connection with the first slug Fig. 1.

In order properly to guide the pin 17 in its motions up and down in its hole the eccentric can be surrounded by a ring 19 fastened in position by a set screw 20 in the lower side of the shell, said ring having a hole 21 for the pin coinciding with the pins hole in the top of the shell.

The slugs are turned by means of shaft 22 connected by threads or otherwise with the firstslug, said shaft having on its outer end a loose sleeve 23 carrying a spring actuated pawl 24 engaging a ratchet pin 25 in the shaft, the ends of said pin projecting from the shaft in line with the pawl. Said pawl. 24- is reversible, the outer end of its shank having a button 26 by means of which the beak of the pawl can be turned (as in dicated by broken lines Fig. 2) to engage the ratchet pin to turn the first or operating slug in the direction desired.

A coil spring 27 connects the sleeve at pin 30 with a fixed head 28 in the shell at pin 31, the function of this spring being to retract the sleeve after it has been rocked to rock the shaft.

The sleeve carrying the pawl for operating the shaft can have fastened to it a strap 32 actuated by foot pedal (not shown) to impart the rocking movement to the shaft, the direction of such movement of the shaft being controlled by the position of the pawl.

The mandrel can be swiveled at its left hand end by means of a bolt 29 engaging a nut 32 in a space provided by spacer 34, the said bolt being engaged with a suitable base, not shown, so that the mandrel can be turned into position for convenient use.

The operation which can be readily gathered from the foregoing is as follows: The

pins 17 all being in lowered position are provided with rivets, as shown. The sheet of metal bent to tube form and with lapped margins to be riveted together is slid onto the mandrel and the first slug 7 operated by the shaft 22 to elevate the rivet as shown in Fig. 1, against the inner side of the lapped metal. The sheet metal is then struck at its upper side immediately above the rivet With a mallet or other tool thus causing said rivet .to perforate the lapped metal after which the protruding point thereof is hammered and spread out in the manner usual in clinching a rivet. When the first rivet has been clinched the second one is raised by a similar operation of the shaft 22 thus actuating the second slug and raising the rivet of that slug the operation of perforat ing the metal margins and clinching the rivet being the same as before described. In this manner the work proceeds until allthe rivets are applied. WVhen all the slugs have been thus turned motion of thefirst slug is reversed by reversing the position of the pawl 24 to resetall the eccentrics in lowered position to receive a fresh set of rivets. In the reverse movement the reactions of the spring27 furnish the motive power for turning the slugs.

The form, number and proportions of the parts shown can be changed without departing from the ist of the inventionas claimed.

What I claim is: r 1. A sheet metal workers riveting mandrel: including a mandrel body, a plurality of movable rivet seats in said body, means within the mandrel body for successively actuating, said rivet seats, said means consisting of, a plurality of slugs carrying eccentrics for supporting said rivet seats and means for successively operating said slugs.

2. A sheet metal workers riveting mandrel including a mandrel body, a plurality of movable rivet seats in said body, means within the mandrel body for successively actuating said rivet seats, said means consisting of a plurality of slugs carrying eccentrics, and mterengaging means between sald slugs for causing the successive actuation of said rivet seats when one of sai'd'slugs is,

actuated.

3. A sheet metal workers riveting mandrel including a mandrel body, a plurality of movable rivet seats in said body, means tuatin said rivet seats, saidmeans consisting of a plurality of rotatable slugs carrying eccentrics, interengaging means between said slugs for causing the successive aotu'a within the mandrel body for successively acincluding a mandrel body, a plurality of .movable rivet seats in said body, means with:

in the mandrel body for successively actuating said rivet seats consisting of a plurality of rockable slugs carrying eccentrics, interengaging means between said slugs foncausing the successive actuation of said rivet seats, said interengaging means permitting a rotation of said slugs in either direction through an arc of substant1ally'180 degrees and including a pa r of pins on one slug and a swinging bar withmeans for arresting the same on the adjacent slug, said. bar.

adaptedto be engaged by said pins by rock the slugs in either direc ing movement 0 tion. V V MARTIN B. 'MoCLEERY. 

